|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

05-06-2017, 12:40 PM
|
|
|
|
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
|
|
Main Gear Axle
I'm hoping to find a builder with a main gear axle available, who could take a few measurements for me. My 12 is flying, and I hate to take things apart right now. Since they come in the finish kit, they are usually not installed until late in the fuselage build sequence. I need the axle flange dimensions, and the bolt pattern. You guessed it. I would like to see if I can make my own axle shims, and I want them to be full flange shims. The measurements, or a print would be fantastic. Just think of what dimensions you would need to make your own.
Thanks for your help
Tom
__________________
2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
|

05-08-2017, 07:48 AM
|
|
|
|
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
|
|
Well. I decided to go ahead and remove my wheel pants and see if I could take some measurements. It was no problem. It looks like the axle base is 2" X 2" and the hole pattern has 1 3/8" center to center spacing, is located equal distance from the center and parallel on each side. I also took a measurement of the wheel camber. It measures a full inch from being perpendicular to the floor at the outside of the tire. Even with 2 aboard and full fuel, it still has a lot of camber, and my plan is to reduce that to a point where the tire will have a fully centered foot print at 1320 lbs............Tom
__________________
2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
|

05-08-2017, 10:31 AM
|
 |
|
|
Join Date: May 2010
Location: Spring Hill Fl
Posts: 734
|
|
hard landing
Tom
I believe that the gear is stronger before it reaches the angle where the tires are vertical.
The gear needs to take up the force of a hard landing.
The tires need to get farther apart for the gear so spread.
On a hard landing the tires are not turning before touchdown, they have to slide sideways to let the gear absorb the load.
Interesting geometry
I would not change this without talking to the people at Vans.
my view
Joe Dallas
Quote:
Originally Posted by todehnal
Well. I decided to go ahead and remove my wheel pants and see if I could take some measurements. It was no problem. It looks like the axle base is 2" X 2" and the hole pattern has 1 3/8" center to center spacing, is located equal distance from the center and parallel on each side. I also took a measurement of the wheel camber. It measures a full inch from being perpendicular to the floor at the outside of the tire. Even with 2 aboard and full fuel, it still has a lot of camber, and my plan is to reduce that to a point where the tire will have a fully centered foot print at 1320 lbs............Tom
|
Last edited by joedallas : 05-08-2017 at 10:46 AM.
|

05-08-2017, 10:44 AM
|
|
|
|
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 685
|
|
Hi Tom,
While building my RV-12 the EAA tech councilors consulted to do periodic inspections during the build gave me a suggestion that seems to have merit when doing the gear alignment.
The suggestion was to use two one foot square pieces of greased aluminum plate under each wheel when making the alignment measurements. The idea being, the wheels will be able to "slide" to their natural position based on the amount of weight applied to the gear.
I have not personally tried this method yet .... but the logic seems sound, so plan to give it a go when I get around to tweaking the gear.
__________________
John
www.dogaviation.com
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!
Donation paid until September 2021
|

05-08-2017, 08:00 PM
|
|
|
|
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
|
|
Quote:
Originally Posted by John-G
Hi Tom,
While building my RV-12 the EAA tech councilors consulted to do periodic inspections during the build gave me a suggestion that seems to have merit when doing the gear alignment.
The suggestion was to use two one foot square pieces of greased aluminum plate under each wheel when making the alignment measurements. The idea being, the wheels will be able to "slide" to their natural position based on the amount of weight applied to the gear.
I have not personally tried this method yet .... but the logic seems sound, so plan to give it a go when I get around to tweaking the gear.
|
This is a fantastic idea. Thanks for passing it on. I will definetly follow through with it before making any changes. ..... Tom
__________________
2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
|

05-08-2017, 08:18 PM
|
|
|
|
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
|
|
Instead of greased aluminum plate, how about wood sitting on 2 or 3 short lengths of 1/2" or 3/4" pipe?
__________________
Joe Gores
RV-12 Flying
|

05-09-2017, 05:03 AM
|
|
|
|
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
|
|
Yeah, I think the wood and pipe would work well also, with less cleanup. It may be a bit more challenging to get the mains up, and in place though
__________________
2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
|

05-09-2017, 08:44 AM
|
|
|
|
Join Date: Mar 2010
Location: Scappoose
Posts: 119
|
|
Actual hole pattern
The hole pattern is actually 1.370 center to center. Not 1.375. If you are going to be having the shims made at a shop that can measure that close it will make a big difference.
|

05-09-2017, 11:00 AM
|
|
|
|
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
|
|
Quote:
Originally Posted by Richard@Langair
The hole pattern is actually 1.370 center to center. Not 1.375. If you are going to be having the shims made at a shop that can measure that close it will make a big difference.
|
Thanks Richard. I would not have expected the 1.370" measurement. I recall an earlier post about someone who had shims made and stated that the hole pattern was a bit off. My guess is that they used 1.375. I won't make that mistake............Tom
__________________
2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
|

05-09-2017, 02:04 PM
|
 |
|
|
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,066
|
|
Definitely keep us posted on this. It would be nice not to wear the tires so uneven.
Are you flying on pavement or grass?
__________________
-
Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 01:26 AM.
|